Mls qos what does mls stand for

This VC is considered the default one. To use this command in VC-class configuration mode, enter the vc-class atm global configuration command before you enter this command.

This command has no effect if the VC class that contains the command is attached to a standalone VC, that is, if the VC is not a bundle member. To use this command to configure an individual bundle member in bundle-VC configuration mode, first enter the bundle command to enact bundle configuration mode for the bundle to which you want to add or modify the VC member to be configured. Then use the pvc-bundle command to specify the VC to be created or modified and enter bundle-VC configuration mode.

For this configuration, Cisco recommends configuring one member of the bundle with the mpls experimental other command.

The following example configures a class named control-class that includes an mpls experimental command that, when applied to a bundle, configures all VC members of that bundle to carry MPLS EXP level 7 traffic. Note that VC members of that bundle can be individually configured with the mpls experimental command at the bundle-vc level, which would supervene. Configures the bumping rules for a VC class that can be assigned to a VC bundle. Creates a bundle or modifies an existing bundle, and enters bundle configuration mode.

Skip to content Skip to search Skip to footer. Book Contents Book Contents. A through C D through F identity policy policy-map through ip rsvp pq-profile ip rsvp precedence through load protocol match access-group through mls ip pbr mls qos global configuration mode through mpls experimental N through P Q through R send qdm message through show atm bundle svc statistics show auto discovery qos through show ip rsvp hello client lsp detail show ip rsvp hello client lsp summary through show lane qos database show mls qos through wrr-queue threshold.

Find Matches in This Book. PDF - Complete Book 4. Chapter: mls qos global configuration mode through mpls experimental. Command Default QoS is globally disabled. Examples This example shows how to enable QoS globally: Router config mls qos Router config This example shows how to disable QoS globally on the Cisco series router: Router config no mls qos Router config Related Commands Command Description mls qos interface configuration mode Enables the QoS functionality on an interface.

Usage Guidelines This command is deprecated on Cisco series routers that are configured with a Supervisor Engine 2. If you disable QoS globally, it is also disabled on all interfaces. Command Default All ports are active on the supervisor engine. Usage Guidelines When you enter the mls qos 10g-only command, a supervisor engine with both 1-Gigabit and Gigabit Ethernet uplink ports reallocates the interface queue capacity to improve the performance of its Gigabit Ethernet ports. Examples The following example shows how to place the supervisor engine in the 10g-only mode: Router configure terminal Router config mls qos 10g-only Related Commands Command Description show mls qos interface Displays QoS information.

Valid actions are: — drop — Drops the packet. Usage Guidelines This policer can be shared by different policy map classes and on different interfaces. Examples The following example shows how to configure a QoS aggregate policer to allow a maximum of bits per second with a normal burst byte size of , to set DSCP to 48 when these rates are not exceeded, and to drop packets when these rates are exceeded: Router config mls qos aggregate-policer micro-one conform-action set-dscp-transmit 48 exceed-action drop Related Commands Command Description police policy map Creates a per-interface policer and configures the policy-map class to use it.

Usage Guidelines The mls qos channel-consistency command is supported on port channels only. Examples This example shows how to enable the QoS-port attribute checks on the EtherChannel bundling: Router config-if mls qos channel-consistency This example shows how to disable the QoS-port attribute checks on the EtherChannel bundling: Router config-if no mls qos channel-consistency mls qos cos To define the default multilayer switching MLS class of service CoS value of a port or to assign the default CoS value to all incoming packets on the port, use the mls qos cos command in interface configuration mode.

Usage Guidelines Cisco , , , , , and Series Routers You can assign the default CoS and differentiated services code point DSCP value to all packets entering a port if the port has been configured by use of the override keyword. Command Default No ingress-CoS mutation table is defined. Usage Guidelines This command is not supported on Cisco series routers that are configured with a Supervisor Engine 2. Examples This example shows how to attach the ingress-CoS mutation map named mutemap2: Router config-if mls qos cos-mutation mutemap2 Related Commands Command Description mls qos map cos-mutation Maps a packet's CoS to a new CoS value.

Command Default No table is defined. Examples This example shows how to attach the egress-exp mutation map named mutemap2: Router config-if mls qos exp-mutation mutemap2 Router config-if Related Commands Command Description mls qos map dscp-mutation Defines a named DSCP mutation map. Usage Guidelines With mls qos loopback applied at the interface, the packets are not forwarded to the destination. Examples This example shows how to prevent packets from being forwarded to the destination: Router config-if mls qos loopback mls qos map To define the multilayer switching MLS class of service CoS -to-differentiated services code point DSCP map or DSCP-to-CoS map, use the mls qos map command in global configuration mode.

Router configure terminal Router config mls qos map dscp-cos 16 18 24 26 to 1 Router config mls qos map dscp-cos 0 8 10 to 0 The following example shows how to define the CoS-to-DSCP map. Router configure terminal Router config mls qos map cos-dscp 8 8 8 8 24 32 56 56 Related Commands Command Description mls qos cos Defines the default CoS value of a port or assigns the default CoS to all incoming packets on the port.

To remove the map, use the no form of this command mls qos map cos-mutation name mutated-cos1 mutated-cos2 mutated-cos3 mutated-cos4 mutated-cos5 mutated-cos6 mutated-cos7 mutated-cos8 no mls qos map cos-mutation name Syntax Description name Name of the CoS map.

Usage Guidelines This command is not supported on the Catalyst series switches and the Cisco series routers that are configured with a Supervisor Engine 2. For example, by entering the mls qos map cos-mutation 2 3 4 5 6 7 0 1 command, you configure this map: CoS-in 0 1 2 3 4 5 6 7 CoS-out 2 3 4 5 6 7 0 1 Separate the eight CoS values by a space. You can configure ingress-CoS mutation on port-channel interfaces. Examples This example shows how to define a CoS-to-CoS map: Router config mls qos map cos-mutation test-map 1 2 3 4 5 6 7 1 Related Commands Command Description show mls qos maps Displays information about the QoS-map configuration and runtime-version.

Router configure terminal Router config mls qos map dscp-cos 16 18 24 26 to 1 Router config mls qos map dscp-cos 0 8 10 to 0 Related Commands Command Description mls qos map cos-dscp Defines the ingress CoS-to-DSCP map for trusted interfaces.

Command Default output-dscp equals input-dscp. Usage Guidelines This command is not supported on the Catalyst series switch and the Cisco series router that are configured with a Supervisor Engine 2.

Command Default No marked-down values are configured. You can enter up to eight policed DSCP values separated by a space. Command Default Port trust is enabled. Usage Guidelines Use the mls qos marking ignore port-trust command to mark packets even if the interface is trusted. Examples This example shows how to mark packets even if the interface is trusted: mls qos marking ignore port-trust This example shows how to re-enable port trust: no mls qos marking ignore port-trust Related Commands Command Description mls qos trust Sets the trusted state of an interface.

Examples This example shows how to disable allocation of the policer-traffic class identification with set actions: Router config mls qos marking statistics This example shows how to allow allocation of the policer-traffic class identification with set actions: Router config no mls qos marking statistics Related Commands Command Description show policy-map interface Displays the statistics and the configurations of the input and output policies that are attached to an interface.

Usage Guidelines You can enter the mls qos mpls trust experimental command to treat MPLS packets as other Layer 2 packets for class of service CoS and egress queueing purposes for example, to apply port or policy trust. Examples This example shows how to turn on the ACL-redirected packet policing: Router config mls qos police redirected This example shows how to turn off the ACL-redirected packet policing: Router config no mls qos police redirected Related Commands Command Description show platform earl-mode Displays platform information.

Command Default This command is disabled by default. Examples The following command example shows how to enable serial policing mode on the PFC3C or PFC3CXL: Router config mls qos police serial mls qos protocol To define routing-protocol packet policing, use the mls qos protocol command in global configuration mode. Examples This example shows how to define the routing-protocol packet policing: Router config mls qos protocol arp police This example shows how to avoid policing completely: Router config mls qos protocol arp pass-through This example shows how to define the IP-precedence value of the protocol packets to rewrite: Router config mls qos protocol bgp precedence 4 This example shows how to define the IP-precedence value of the protocol packets to rewrite and police the DSCP value: Router config mls qos protocol bgp precedence 4 police Related Commands Command Description show mls qos protocol Displays protocol pass-through information.

Command Default Quality of service QoS is globally disabled. Examples This example shows how to enable the port-queueing mode globally: Router config mls qos queueing-only This example shows how to disable the port-queueing mode globally: Router config no mls qos queueing-only Related Commands Command Description mls qos global configuration mode Enables the QoS functionality globally.

Command Default The queuing mode of an interfaces is class of service CoS mode. Usage Guidelines This command is supported on Gigabit Ethernet ports only. Examples This example shows how to set the queuing mode to DSCP on an interface: mls qos queue-mode mode-dscp Related Commands Command Description priority-queue queue-limit Allocates the available buffer space to a queue.

Examples The following example shows how to enable ToS-to-DSCP rewrite in slot 4: Router config mls qos rewrite ip dscp slot 4 The following example shows how to disable port-queueing mode globally: Router config no mls qos rewrite ip dscp Related Commands Command Description mls qos global configuration mode Enables the QoS functionality globally. Usage Guidelines You must enable data export globally to set up data export on your Cisco series router.

QoS-statistics data export is not supported on OSM interfaces. Examples This example shows how to enable data export globally: Router config mls qos statistics-export This example shows how to disable data export globally: Router config no mls qos statistics-export Related Commands Command Description show mls qos statistics-export info Displays information about the MLS-statistics data-export status and configuration. Command Default Disabled for all shared aggregate policers.

Command Default The default delimiter is the pipe character. Examples This example shows how to set the QoS-statistics data-export field delimiter a comma and verify the configuration: Router config mls qos statistics-export delimiter , Related Commands Command Description show mls qos statistics-export info Displays information about the MLS-statistics data-export status and configuration.

Command Default The default is none unless syslog is specified. Caution Be careful when decreasing the interval because exporting QoS statistics imposes a noticeable load on the Cisco series router.

Examples This example shows how to set the QoS-statistics data-export interval: Router config mls qos statistics-export interval Related Commands Command Description show mls qos statistics-export info Displays information about the MLS-statistics data-export status and configuration. Defaults This command is disabled by default. Usage Guidelines Packets that enter a QoS domain are classified at its edge. Examples The following example shows how to set the trusted state of an interface to IP precedence: Router config-if mls qos trust ip-precedence The following example shows how to configure CDP to detect a Cisco IP phone connected to the port: Router config-if mls qos trust device cisco-phone Related Commands Command Description mls qos cos Defines the default CoS value of a port or assigns the default CoS to all incoming packets on the port.

Usage Guidelines This command is supported on switch-port and port-channel interfaces only. Examples This example shows how to configure the PIDs: router config-pmap-c-metric monitor pids Related Commands Command Description show policy-map type performance-traffic Displays policy-map information along with the monitored PIDs, if configured.

Examples The following example configures a class named control-class that includes an mpls experimental command that, when applied to a bundle, configures all VC members of that bundle to carry MPLS EXP level 7 traffic. Was this Document Helpful? Yes No Feedback. Related Cisco Community Discussions. Support for this command was introduced on the Supervisor Engine Enables the QoS functionality on an interface.

This command was implemented on the Cisco and Cisco Support for this command was introduced on the Cisco series router. CoS Value. DSCP Value. DSCP Values. Displays information about the QoS-map configuration and runtime-version. DSCP values; valid values are from 0 to Defines mapping. EXP values; valid values are from 0 to 7.

Name of the DSCP mutation map. Name of the EXP-mutation map. DSCP value. Optional DSCP values. Protocol name. You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. Classification and Marking. SW sh mls qos maps cos-dscp Cos-dscp map: cos: 0 1 2 3 4 5 6 7 dscp: 0 8 16 24 32 40 48 56 We can actually change this mapping. This is it so far for Marking and Classification. Share this: Twitter Facebook.

Like this: Like Loading Published by davidsudjiman. Pingback: QoS np2ie. How does QoS work? Quality of Service QoS is a suite of technologies used to manage bandwidth usage as data crosses computer networks.

Queues provide bandwidth reservation and prioritization of traffic as it enters or leaves a network device. If the queues are not emptied, they overflow and drop traffic. What is DiffServ QoS model? Differentiated services. Differentiated services or DiffServ is a computer networking architecture that specifies a simple and scalable mechanism for classifying and managing network traffic and providing quality of service QoS on modern IP networks.

How do I use QoS for gaming? The user name is admin. Select the Upstream QoS tab. What are DSCP markings? This can be used to determine which network traffic requires higher bandwidth, has a higher priority, and more likely to drop packets.

Optionally, specify the class map with the match-all or match-any option. Step 2 Configure the class-map clause. Note: CLI may show unsupported match clauses. Class maps only define traffic profiles. Policy maps apply class maps to QoS functions. To define a policy map and tie a class map to a policy map, perform the following steps:.

Step 4 Apply policy maps to interfaces on an ingress or egress basis. Step 5 Configure the ingress trust state of the applicable interface. Always enable QoS globally using the mls qos or qos global command to enable a Catalyst switch to enact QoS configurations. This example used a Cisco Catalyst for demonstration. Different Catalyst switches support additional or fewer options for policy maps and class maps depending on platform and software version.

Check the product configuration guides on Cisco. For example, to configure an interface to trust DSCP on the Catalyst and families of switches running Cisco IOS, the command is qos trust dscp instead of mls qos trust dscp. Example illustrates a sample configuration for a policy map and class map configuration. Network-Based Application Recognition adds intelligent network classification to switches and routers. In brief, NBAR supports these types of classification features:.

Always refer to the product documentation for the latest supported NBAR protocol list. As such, use the following steps to configure NBAR-based classification:. Step 3 Create a traffic policy by associating the traffic class with one or more QoS features in a policy map. Step 5 Enter QoS-supported parameters in the policy map class configuration mode.

These parameters include marking the DSCP value, traffic policing, etc. Step 6 Attach the traffic policy to the interface for ingress or egress application. Policy-based routing PBR provides a flexible means of routing packets by allowing you to configure a defined policy for traffic flows, lessening reliance on routes derived from routing protocols.

It gives you more control over routing by extending and complementing the existing mechanisms provided by routing protocols. It also allows you to specify a path for certain traffic, such as priority traffic over a high-cost link. Setting IP Precedence bits, giving the network the ability to enable differentiated classes of service.

Policies are based on IP addresses, port numbers, protocols, or size of packets. For a simple policy, you can use any one of these descriptors; for a complicated policy, you can use all of them. For example, classification of traffic through PBR allows you to identify traffic for different classes of service at the edge of the network and then implement QoS defined for each CoS in the core of the network, using priority queuing PQ , custom queuing CQ , or weighted fair queuing WFQ techniques.

This process obviates the need to classify traffic explicitly at each WAN interface in the backbone network. PBR classification does not scale well in enterprise networks. Furthermore, the Catalyst family of switches does not support all of the PBR features using hardware switching; consult Cisco. In addition, the other Catalyst families of switches listed in Table do not support PBR or do not support PBR in hardware at the time of publication of this text.

For more details on PBR restrictions on the Catalyst family of switches, refer to the following white paper on Cisco. Marking is configurable on a per-interface basis or via a policy map. For example, configuring a policy map to mark all frames from a video server on a per-interface basis to a DSCP value of 40 results in an internal DSCP value of 40 as well.

Marking also may be a result of a policer. An example of marking using a policer is a Catalyst switch marking DSCP to a lower value for frames above a specified rate. In deploying or designing new networks, use Layer 3 whenever possible. Note: The COS field is only applicable to Figure Layer 2 CoS Field of a To configure marking as part of the policy map for classification based on ACLs, use any of the following class-map action commands, depending on application:.

Example illustrates an example of a policy map with a class-map clause of marking frames with an IP DSCP value of The following sections discuss policing and shaping on Catalyst switches in more detail.

Both shaping and policing mechanisms control the rate at which traffic flows through a switch. Both mechanisms use classification to differentiate traffic. Nevertheless, there is a fundamental and significant difference between shaping and policing. Shaping meters traffic rates and delays buffers excessive traffic so that the traffic rates stay within a desired rate limit.

As a result, shaping smoothes excessive bursts to produce a steady flow of data. Reducing bursts decreases congestion in downstream routers and switches and, consequently, reduces the number of frames dropped by downstream routers and switches. Because shaping delays traffic, it is not useful for delay-sensitive traffic flows such as voice, video, or storage, but it is useful for typical, bursty TCP flows.

Figure illustrates an example of traffic shaping applied to TCP data traffic. Figure Traffic-Shaping Example. In contrast to shaping, policing takes a specific action for out-of-profile traffic above a specified rate. Policing does not delay or buffer any traffic. The action for traffic that exceeds a specified rate is usually drop ; however, other actions are permissible, such as trusting and marking.

Policing on Catalyst switches follows the leaky token bucket algorithm, which allows for bursts of traffic compared to rate limiting. Figure illustrates the leaky token bucket algorithm. Figure Leaky Token Bucket. When switches apply policing to incoming traffic, they place a number of tokens proportional to the incoming traffic packet sizes into a token bucket in which the number of tokens equals the size of the packet. At a regular interval, the switch removes a defined number of tokens, determined by the configured rate, from the bucket.

If the bucket is full and cannot accommodate an ingress packet, the switch determines that the packet is out of profile. The switch subsequently drops or marks out-of-profile packets according to the configured policing action. It is important to note that the leaky bucket does not actually buffer packets, although the diagram in Figure alludes to this point. The traffic is not actually flowing through the bucket; Catalyst switches simply use the bucket to determine out-of-profile packets. Furthermore, each Catalyst switch's hardware implementation of policing is different; therefore, only use the leaky token bucket explanation as a guide to understanding the difference between policing and shaping and how policing limits traffic.

A complete discussion of the leaky token bucket algorithm is outside the scope of this book. Consult the following document on Cisco. Policing is configured using several parameters. Policing configurations apply the following parameters not all parameters are configurable on all Catalyst switches :. Each Catalyst switch supports different rates and different rate increments.

Various Catalyst switches support various burst ranges with various increments. The violate action adds a third measurement for out-of-profile traffic. Applicable violate actions are drop, transmit, and mark. RFC discusses three-color marking, the basis for the addition of violate action on Cisco Catalyst switches.

There are many white papers, books, and tech notes on how to correctly configure the burst size to handle TCP traffic effectively. One leading recommended formula for configuring burst is as follows:. RTT can be determined from sophisticated methods such as traffic analysis tools to simple tools such as ping. Rate is throughput end-to-end. For more information on configuring recommended burst sizes, refer to Cisco. Applying a policer that limits traffic to 75 Mbps on each interface is an example of an individual policer.

For example, an aggregate policer that is defined to limit traffic to 75 Mbps to a group of interfaces limits the total traffic for all interfaces to 75 Mbps. As a result, the group of interfaces can achieve only 75 Mbps among all members with an aggregate policer, whereas an individual policer applies policing parameters on a per-interface basis.

Several models of Catalyst switches support application of policing not only on a per-interface basis but also on a per-VLAN basis. Check the product configuration guide for support applications of policing on a per-VLAN basis. Configuring individual or microflow policers on Catalyst switches is via policy maps. To specify an individual policer or microflow policer as a class-map action clause, use the following command:.

Not all families of Catalyst switches and software versions support all the options listed in the preceding police command; always check the configuration guides on Cisco. As with the policy-map configuration, not all families of Catalyst switches support the entire options list with the mls qos aggregate-policer command. To tie an aggregate policer to a class-map action clause in a policy map, use the following command:. Example illustrates a sample configuration of an individual policer on a Catalyst switch.

The following sections discuss congestion management and congestion avoidance. Congestion management is the key feature of QoS because it applies scheduling to egress queues. Catalyst switches use multiple egress queues for application of the congestion-management and congestion-avoidance QoS features.